kg automobile traveling at a typical highway speed of 65 mi/h have? By what factor would its kinetic energy decrease if the car traveled half as fast?…

How many joules of kinetic energy does a 750-kg automobile traveling at a typical highway speed of 65 mi/h have?By what factor would its kinetic energy decrease if the car traveled half as fast?How fast (in mi/h) would the car have to travel to have half as much kinetic energy as in part A?